Homework Statement
Use the components method to solve this problem.
A river is flowing at 1.75 m/s. The river is 820m wide. You are on a boat that is going dock on the other side of the river, and 940 m upstream. If you need to get to the other dock in 10 minutes, what must the speed of...
Homework Statement
While driving on the interstate 83, you notice a friend half a mile in front of you. Assuming your friend is driving at the legal 65 miles per hour, determine how fast you would have to travel (with respect to land) to catch him in 5 minutes.
Homework Equations...
[SOLVED] Logarithms and Exponents Question
Homework Statement
5^{x}=41
The attempt at a solution
Well, I know that one way to figure this out would be that to find a common base for both sides of the equation and then use the known exponent to find the variable. The only thing...
[SOLVED] Machines Problem
Homework Statement
A ramp, 18m long and 4.5m high is set up in order to wheel a 25-kg box at a constant speed. Assume that by wheeling it there is no friction.
Homework Equations
IMA= \frac{d_{in}}{d_{out}}
The Attempt at a Solution
I know this is a...
[SOLVED] Power problem!
Homework Statement
(a) How many joules of electrical energy are used by a 1650-W hair dryer in 10 min? (b) If the dryer is operated a total of 4.5 h during one month, how much will this contribute to the electrical bill if the billing rate is 12 cents/kWh...
[SOLVED] Problem about the Conservation of Energy
Homework Statement
When a certain rubber ball is dropped from a height of 1.25m onto a hard surface, it loses 18% of its mechanical energy on each bounce. (a) How high will the ball bounce on the first bounce? (b) How high will it bounce on...